My suggestion would be to use MCSkinedit or go to NovaSkin on the internet to make a custom one. Practice, perhaps reviewing skins made by other people. I've discovered for myself that making my own skins is quite enjoyable!
This is a big deal to me. Of course, night vision potion helps, but it's just not the same. Maybe a whole new block altogether. My take is that glass is too weak for deep depths. There should be a completely new block, like plex glass. Harder to make (more expensive) but durable enough for underwater. The other benefit, this should allow complete vision underwater. Therefore, bases underwater would be worth looking around at the other things around underwater.
1.7, because it's the latest version that my machinima movie making mods will work on.